Hi Vamsi,
Please check below once:
1. Are you able to ping app id (in admin cockpit) for the given odata service?
2. Do you see a response when you run http://smpserver:port in iOS simulator?
3. Are you able to register the same app id through rest client? and getting backend info? (you may refer SMP 3.0 : REST API Application Development)
Let me call Brenton O'Callaghan for more inputs.
Regards,
JK